New York Natural Heritage Program
Broad-lipped Twayblade
Listera convallarioides (Sw.) Nutt. ex Ell.
Monocots
Listera convallarioides line drawing Britton, N.L., and A. Brown (1913); downloaded from USDA-Plants Database.
Family: Orchid Family (Orchidaceae)

State Protection: Endangered
listed species are those with: 1) 5 or fewer extant sites, or 2) fewer than 1,000 individuals, or 3) restricted to fewer than 4 U.S.G.S. 7 minute topographical maps, or 4) species listed as endangered by U.S. Department of Interior.

Federal Protection: Not Listed

State Rarity Rank: S1
A State Rarity Rank of S1 means: This plant is endangered/critically imperiled in New York because of extreme rarity (typically 5 or fewer populations or very few remaining individuals) or is extremely vulnerable to extirpation from New York due to biological factors.

Global Rarity Rank: G5
A Global Rarity Rank of G5 means: This species is demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.


Did you know?
The species name comes from the resemblance of this orchid's leaves to the leaves of Lily of the Valley in the genus Convallaria (meaning a valley). A touch of the flower column triggers a squirt of a pollen-filled liquid that sticks to the pollinator insect's back. After the dust-like seeds mature and disperse they grow underground for 2-3 years before producing leaves.

State Ranking Justification [-]
There is one known population and a second population that was reported around 1980. There have been 13 historical reports, but most of these sites have not been surveyed recently. There is a lot of additional habitat available that needs to be searched, but even if all populations were discovered this plant will likely still be considered rare in New York.

Short-term Trends [-]

Long-term Trends [-]